Table 1.

Progression rate of geographic atrophy area according to the zone 1 to 6

Atrophic area	Initial area (mm2)	Rate of progression (mm2/yr)	Ratio of increase
Total area	8.09 ± 0.10	2.440	2.02
Zone 1	0.07 ± 0.10	0.011	1.45
Zone 2	0.23 ± 0.18	0.072	1.67
Zone 3	0.48 ± 0.30	0.210	1.84
Zone 4	0.92 ± 0.31	0.380	1.97
Zone 5	0.85 ± 0.22	0.510	1.99
Zone 6	0.95 ± 0.45	0.640	2.00

Values are presented as mean ± standard deviation unless otherwise indicated.